Power roller element



FIG. 1 is a perspective view of a power roller element showing my new design;

FIG. 2 is an end elevational view thereof, the opposite end elevational view being a mirror image of that shown;

FIG. 3 is a side elevational view thereof, the opposite side elevational view being a mirror image of that shown;

FIG. 4 is a perspective view of a second embodiment, showing the power roller elements are on the ends of the cylinder; and

FIG. 5 is a perspective view of a third embodiment, showing the power roller element is on the central portion of the cylinder. 

The ornamental design for a power roller element, as shown and described. 